Boot for hot-air stacks.



-A. G. SCHERER.

BOOT FOR HOT Am 'STACKS.

PLICATION FILED MAR 2 I r 1,192,121. I Patenfed July 25, 1916.

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ALBERT G. SCHERER, OF CHICAGO, ILLINOIS, AS SIGNOR 'IO EXCELSIOB STEEL FURNACE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BOOT FOR HOT-AIR STACKS.

Specification of Letters Patent.

Patented July 25, 1916.

Application filed March 25, 1915. Serial No. 16,833.

To all whom it may concern:

Be it known that I, ALBERT G. SGI-IERER, a citizen of the United States, and a resident of the city of Chicago and State of Illinois, have invented certain new and useful Improvements in Boots for Hot-Air Stacks, of which the following is a specification.

My invention relates to hot-air stacks and more particularly to the construction of what are commercially known as the boots for hot-air stacks.

As is well-known the distributing conduits or pipes leading from a hot-air furnace are of divers sizes and dimensions, cylindrical in transverse section, and upon reaching the service stacks or fiues which are usually rectangular in transverse section and of different dimensions, said pipes are connected to a boot. Owing to the various dimensions of these distributing pipes it has heretofore been necessary for a tinsmith or other tradesman to keep in stock a considerable assortment of pipes, boots, and stack sections or else a corresponding assortment of patterns for the same, which is expensive to the ordinary shop.

It is therefore an object of my present invention to provide a boot which can economically be made to accommodate distributing pipes of sizes within a large range of dimensions instead of' being compelled as heretofore to make up different boots for each size of distributing pipe which are used in the present practice for making distribution from furnaces.

A further object of my invention is to so construct the boot of a hot-air stack that the distributing pipe leading from the furnace to the same will have its end portion so disposed therein as to provide an air space or insulation and thereby prevent, as far as possible, the conduction of the heat of said distributing pipe to the boot and thereby to the flue or stack.

I prefer to accomplish the above and other objects of my invention by the means and in the manner hereinafter fully described. and as more particularly pointed out in the claims, reference being had to the accompanying drawings forming a part of this specification in which,

' Figure 1 is a vertical side elevation of my invention disposed upon the upper end of a distributing pipe the stack having been disconnected and removed therefrom. Fig. 2

is a vertical axial section of the samewith the portion of the boot above the base thereof broken away and showing the air-space or insulation between the boot and distributing pipe.

Referring to the drawings, 5 represents the upper end portion of a distributing pipe of a hot-air heating system or furnace, and 6 1s a boot of well known form that preferably connects or joins said pipe to the stack (not shown) which in this instance is of rectangular cross-section.

In order to accommodate the pipe and stack it is necessary to construct this boot of irregular form similar to that shown in the drawing wherein it will be observed that the lower or base portion comprises a substantially cylindrical-shaped drum 7. The upper or top portion of said boot is preferably substantially rectangular in cross section to provide a connection 8 upon which the stack of corresponding shape and dimensions is adapted to be mounted. The intermediate portion 9 of said boot is substantially conical in shape the circular or cylindrical lower portion of which merges into the rectangular upper portion, and said intermediate portion of the boot is provided with an inner wall 10 for the purpose of providing an air space therebetween forming a heat insulation.

The cylindrical base 7 is preferably secured to the intermediate portion of the boot by a seam 11 or otherwise. Its lower edge is provided with a relatively small bead or lateral flange 12, to which an annular plate or ring 14 of substantially L-section is secured by bending the circumferential edge 13 of the latter around said bead 12. The

inner edge of said plate surrounding the 9 central opening therein is preferably bent laterally to itself to form an annular flange 15 so that when a length of pipe 5 is in-- sorted into the lower portion or base of the boot said flange 15 will fit snugly against the exterior surface of said pipe and provide a sliding fit therefor. It will be obvious that by varying the size of the opening in said plate 14 distributing pipes of divers sizes may be readily and quickly fitted into the boot, and all that it is necessary for the manufacturer to carry in stock is an assortment of these rings of a diameter to fit the cylindrical base 7 of the boot and provided with openings of various diameters to fit the pipes of standard sizes. It will also be perceived that the ring 14: secures a spacing of the pipe 5 from the wall of the boot'which interposes an air-space therebetween which serves to prevent the easy transmission of heat from the comparatively hot distributing pipe to the walls of the boot which enter or connect with the stack which is installed within the walls of the building. This construction materially reduces the lia-- bility to fire caused from overheating the stack.

While I have illustrated and described certain specific means for carrying out my invention it, of course, will be obvious to others skilled in the art, that modifications and refinements thereof are possible without materially departing from the spirit or" my invention. I therefore desire it understood that all such changes are contemplated within the scope of my invention as expressed in the appended claims.

What I claim as new is,-

1. Means for connecting a pipe of circular section, a hotair stack of rectangular cross-section comprising a ring adapted to be secured to an opening in the stack and 7 gage the adjacent portion of the pipe.

2. A boot for air stacks comprising a body portion a base therefor, and a ring secured to said base and extended inwardly therefrom and provided at its inner edge with a continuous lateral flange adapted to lie adjacent and circumferentially engage the adjacent portion of a pipe when inserted therein.

3. Means for connectinga pipe of circular section to a hot-air stack of rectangular section comprising a ring adapted to be secured to an opening in the stack and provided with a continuous laterally extending flange adapted to circumferentially contact and engage the adjacent portion of the pipe.

Signed at Chicago, Cook county, Illinois, this 16th day of March, 1915.

ALBERT e. sonnnnn. V Witnesses E. K. LUNDY, Jr., WM. :FCIAROLD EIonnLMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

